Fabricated aluminum alloy double-layer grid structure

Abstract

The invention discloses an assembly type aluminum alloy double-layer grid structure which comprises a grid upper-layer rod, a grid lower-layer rod and a plurality of stand columns. A plurality of upright quadrangular pyramid web members are arranged between the net rack upper-layer rods and the net rack lower-layer rods; through prefabricated standardized net rack upper-layer rods and net rack lower-layer rods and efficient upper connecting base and lower connecting base connecting joints, on-site rapid assembly is achieved. The net rack upper-layer rod is composed of an upper chord, an upper chord connecting rod and an upper connecting seat, the net rack lower-layer rod is composed of a lower chord, a lower chord connecting rod and a lower connecting seat, and the upper connecting seat and the lower connecting seat are in butt joint by positively placing the quadrangular pyramid web member, so that butt joint of the upper-layer rod piece and the lower-layer rod piece of the net rack is achieved, and a stable space structure system is formed. The double-layer grid structure adopts a modular design, and an aluminum alloy material has the advantages of light weight and corrosion resistance, so that the self weight of the structure can be obviously reduced, and the foundation and transportation cost can be reduced; and each connecting node can be quickly assembled and disassembled, so that the construction time is saved.

Description

Technical Field

[0001] The present invention relates to the technical field of building structures, and more specifically, to an assembled aluminum alloy double-layer grid structure. Background Art

[0002] As a light, high-rigidity, and efficient spatial structure, double-layer grid structures are widely used in large-span buildings, such as gymnasiums, exhibition halls, and warehouses. The main advantages of this type of structure are that it has uniform force, good structural integrity, and can effectively resist vertical and horizontal loads (such as wind loads, earthquakes, etc.). Therefore, it has been widely used in the design and construction of large-span buildings. The current double-layer grid structure system mainly uses steel structures.

[0003] Although the existing steel double-layer grid structure system is very mature, it has certain limitations in certain application scenarios, such as temporary buildings or structures that need to be built quickly: first, it is heavy and complex to construct. The weight of the steel structure is large, and a large amount of mechanical equipment is required during transportation and installation, which increases the cost and construction difficulty; second, the construction period is long. Due to the need for welding and complex connection methods, the construction period of the steel structure is usually long, which is not suitable for occasions that require rapid installation and disassembly; in addition, there is the problem of steel structure anti-corrosion. Steel is easy to rust in a humid and corrosive environment and requires regular maintenance, especially in highly corrosive environments such as outdoors and seaside; finally, there is also the problem of insufficient flexibility. The existing steel structure system is usually designed for permanent buildings, which is not easy to adapt to the needs of temporary buildings and difficult to quickly disassemble and rebuild. These factors restrict the application of double-layer grid structures, especially in temporary buildings and non-permanent buildings such as buildings that need to be built quickly.

[0004] In some existing double-layer grid structures, there are currently two main forms of node connections for space grid structures: spiral ball nodes and welded ball nodes. The bolt ball node has multiple holes with internal threads on a ball, which are used to connect multiple steel pipes at one point. It consists of parts such as bolts, steel balls, pins (or screws), sleeves, and cone heads or sealing plates. The welded ball node is a hollow ball welded from two hemispheres, and can use hollow balls without ribs and hollow balls with ribs according to the size of the force. The bolt ball in the prior art is positioned by a pin, and the bolt ball construction requires high precision, so it is impossible to achieve convenient construction and disassembly. The welded ball node uses a hollow ball and a welded pipe to weld and dock on site, which is greatly affected by the temperature and wind speed. The material cutting and welding are manual, and the material cutting positioning and welding have large errors and low precision. The weld is prone to quality defects such as slag inclusions and pores, and the pass rate of the second-level flaw detection is low. The welded pipe has stress deformation before and after welding, which poses a safety hazard. It is continuously released after use. The angle control between various rods is not accurate, which can easily twist the rods, destroy the balanced force transmission, and increase the deflection of the steel structure. It cannot meet the requirements of a line of curved surfaces and large spans, and the quality is difficult to guarantee, which has great limitations.

[0005] Based on the above reasons, the present invention proposes an assembled aluminum alloy double-layer grid structure system to solve the limitations of the existing double-layer grid structure system in assembled buildings. Summary of the invention

[0006] The invention discloses an assembled aluminum alloy double-layer grid structure, comprising grid upper rods, grid lower rods and a plurality of columns; a plurality of upright quadrangular pyramidal web rods are arranged between the grid upper rods and the grid lower rods; the grid upper rods comprise a plurality of upper chord rods, a plurality of upper chord connecting rods and a plurality of upper connecting seats, and the upper chord rods are connected to the upper chord connecting rods via the upper connecting seats; the grid lower rods comprise a plurality of lower chord rods, a plurality of lower chord connecting rods and a plurality of lower connecting seats, and the lower chord rods are connected to the lower chord connecting rods via the lower connecting seats; one end of the upright quadrangular pyramidal web rod is connected to the upper connecting seat, and the other end is connected to the lower connecting seat; the lower connecting seat is connected to the top of the column, and a base is arranged at the bottom of the column.

[0007] Preferably, the upper connecting seat includes an upper node assembly and an upper connecting shaft; the upper node assembly includes an upper node body, an upper mounting hole is provided on the top of the upper node body, a first wing plate and a second wing plate are provided on one side, and a third wing plate and a fourth wing plate are provided on the other side; the first wing plate and the third wing plate are symmetrically arranged, and the second wing plate and the fourth wing plate are symmetrically arranged; the upper node body is provided with a through slot, the connecting shaft passes through the through slot, and a bolt is provided in the upper mounting hole to connect with the upper connecting shaft; end connecting holes are respectively provided at both ends of the upper connecting shaft.

[0008] Preferably, the surface of the upper connecting shaft is provided with a plurality of outer limit grooves, and the upper node body is provided with inner limit grooves matching with the outer limit grooves; the second wing plate and the fourth wing plate are arranged horizontally, and the first wing plate is arranged at an angle to the second wing plate.

[0009] Preferably, the lower connecting seat includes a lower node assembly and a lower connecting shaft; the bottom of the lower node assembly is provided with a detachable side support as needed; the lower node assembly includes a lower node body, and the lower connecting shaft is nested in the lower node body; snap-in grooves are respectively provided on both sides of the lower node body, and a snap-in strip matched with the snap-in groove is provided on the side support, and the side support and the lower node body are snap-connected through the snap-in groove and the snap-in strip; the side support is connected to the top of the column.

[0010] Preferably, the structure of the upper node assembly is the same as that of the lower node assembly, and the structure of the upper connecting shaft is the same as that of the lower connecting shaft.

[0011] Preferably, an articulated mechanism is provided between the side support and the column; the articulated mechanism comprises an upper articulated seat and a lower articulated seat, the upper articulated seat is connected to the bottom of the side support, and the lower articulated seat is connected to the top of the column; the upper articulated seat and the lower articulated seat are rotatably connected via a latch.

[0012] Preferably, the end of the upper chord is matched with the upper connecting shaft; during installation, the upper connecting shaft is inserted into the end of the upper chord and fixedly connected by bolts or pins; the end of the lower chord is matched with the lower connecting shaft; during installation, the lower connecting shaft is inserted into the end of the lower chord and fixedly connected by bolts or pins.

[0013] Preferably, the base includes a column foot connector and a ground connector, the column foot connector includes a plug-in portion, a cover plate and a semi-rigid connecting seat, the plug-in portion is inserted into the bottom of the column and fixedly connected by bolts; the cover plate is used to seal the bottom of the column, and the semi-rigid connecting seat is arranged at the bottom of the cover plate; the ground connector includes a bottom plate and a plug-in base, the bottom plate is used to connect the bottom surface, the plug-in base is provided with a plurality of pin holes, and the pin holes are connected to the semi-rigid connecting seat through pin shafts.

[0014] Preferably, the lower chord rod is a multi-segment line of m equal parts of the lower chord arc line, the chord length of the lower chord arc is md, and the radius of the lower chord arc line is R 1 The following conditions are met:

[0015] The angle of the lower chord arc θ 1 The following conditions are met:

[0016] Standard length of lower chord d 1 The following conditions are met:

[0017] The upper chord rod is the straight-line distance between the two end points of the upper chord arc line, and the radius R of the upper chord arc line 2 The following conditions are met: 2 =R 1 +h;

[0018] The number of cells of the upper chord is m-1, and the angle of the upper chord arc is θ 2 The following conditions are met: -β≤θ 2 ≤β,

[0019] The sagitta of the upper chord arc f 2 The following conditions are met: 2 =R 2 (1-cosβ);

[0020] Quasi length of upper chord d 2 The following conditions are met:

[0021] Standard member length d of upright tetrahedral pyramid web member 3 The following conditions are met:

[0022] Among them, d is the standard size of the building column grid;

[0023] d 1 It is the standard length of the lower chord;

[0024] d 2 is the quasi-length of the upper chord;

[0025] d 3 It is the standard member length of the upright tetrahedral cone web member;

[0026] m is the number of units in the span direction of the grid;

[0027] n is the number of units in the length direction of the grid;

[0028] H is the height of the top of the lower chord column of the grid;

[0029] f 1 Arch height of lower chord of grid frame;

[0030] h Grid height.

[0031] The assembled aluminum alloy double-layer grid structure provided by the present invention realizes rapid on-site assembly by prefabricating standardized grid upper rods and grid lower rods, as well as efficient upper connecting seats and lower connecting seats connecting nodes. The grid upper rods are composed of upper chord rods, upper chord connecting rods and upper connecting seats, and the grid lower rods are composed of lower chord rods, lower chord connecting rods and lower connecting seats. The upper connecting seat and the lower connecting seat are docked by placing the four-cornered pyramid web rods upright to achieve the docking of the upper and lower rods of the grid and form a stable spatial structure system. The double-layer grid structure of the present invention adopts a modular design, and the aluminum alloy material has the advantages of lightweight and corrosion resistance, which can significantly reduce the dead weight of the structure and reduce the foundation and transportation costs; each connection node can be quickly assembled and disassembled, saving construction time. In addition, each component can be reused, which is convenient for recycling and reuse, and can be adjusted according to different terrains and environmental conditions, and has strong adaptability. The present invention has high strength and excellent wind and earthquake resistance, and is particularly suitable for large-span building scenes such as temporary exhibition venues, stadiums, and storage facilities. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0033] Figure 1 It is a structural diagram of the assembled aluminum alloy double-layer grid structure of the present invention;

[0034] Figure 2 It is a structural diagram of the assembled aluminum alloy double-layer grid structure of the present invention;

[0035] Figure 3 It is an enlarged view of the A portion of the assembled aluminum alloy double-layer grid structure of the present invention;

[0036] Figure 4 It is a partial exploded view of the B portion of the assembled aluminum alloy double-layer grid structure of the present invention;

[0037] Figure 5 It is a partial exploded view of another angle of the B portion of the assembled aluminum alloy double-layer grid structure of the present invention;

[0038] Figure 6 It is an enlarged view of the C position of the assembled aluminum alloy double-layer grid structure of the present invention;

[0039] Figure 7 It is a schematic diagram of the installation result of the base of the assembled aluminum alloy double-layer grid structure of the present invention;

[0040] The marks in the drawings are as follows:

[0041] 1--upper layer rod of grid, 11--upper chord rod, 12--upper chord connecting rod, 13--upper connecting seat, 131--upper connecting shaft, 132--upper node body, 133--mounting hole, 134--first wing plate, 135--second wing plate, 136--third wing plate, 2--lower layer rod of grid, 21--lower chord rod, 22--lower chord connecting rod, 23--lower connecting seat, 231--lower connecting shaft, 232--side support, 233--lower node body, 3--column, 4--upright tetrahedral pyramid web rod, 5--base, 51--cover plate, 52--semi-rigid connecting seat, 53--bottom plate, 54--plug base, 6--sleeve. DETAILED DESCRIPTION

[0042] The present invention discloses an assembled aluminum alloy double-layer grid structure, which realizes rapid on-site assembly by prefabricating standardized grid upper rods and grid lower rods, as well as efficient upper connecting seats and lower connecting seats connecting nodes. The grid upper rods are composed of upper chord rods, upper chord connecting rods and upper connecting seats, and the grid lower rods are composed of lower chord rods, lower chord connecting rods and lower connecting seats. The upper connecting seat is docked with the lower connecting seat by placing the four-cornered pyramid web rods upright to achieve the docking of the grid lower rods and form a stable spatial structure system. It has the advantages of lightweight and corrosion resistance, can significantly reduce the dead weight of the structure, and reduce the foundation and transportation costs; each connection node can be quickly assembled and disassembled, saving construction time. In addition, each component can be reused, which is convenient for recycling and reuse. At the same time, it can be adjusted according to different terrains and environmental conditions, and has strong adaptability.

[0043] The following is a clear and detailed description of the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] See also Figures 1 to 7The present invention provides an assembled aluminum alloy double-layer grid structure, comprising a grid upper layer rod 1, a grid lower layer rod 2 and a plurality of columns 3; a plurality of upright quadrangular pyramid web rods 4 are arranged between the grid upper layer rod 1 and the grid lower layer rod 2; the grid upper layer rod 1 comprises a plurality of upper chord rods 11, a plurality of upper chord connecting rods 12 and a plurality of upper connecting seats 13, the upper chord rods 11 and the upper chord connecting rods 12 are connected via the upper connecting seats 13; the grid lower layer rod 2 comprises a plurality of lower chord rods 21, a plurality of lower chord connecting rods 22 and a plurality of lower connecting seats 23, the lower chord rods 21 and the lower chord connecting rods 22 are connected via the lower connecting seats 23; one end of the upright quadrangular pyramid web rod 4 is connected to the upper connecting seat 13, and the other end is connected to the lower connecting seat 23; the lower connecting seat 23 is connected to the top of the column 3, and a base 5 is arranged at the bottom of the column 3.

[0045] In order to solve these limitations of the existing double-layer grid structure system in large-span buildings, the present invention proposes an assembled aluminum alloy double-layer grid structure system. This structural system has significant innovations and improvements in structural design and material application, and can simplify the installation and transportation process while maintaining structural strength and rigidity. It is particularly suitable for temporary or semi-permanent buildings that need to be quickly built, such as exhibition halls, warehouses, temporary stadiums, etc. Specifically, in an embodiment of the present invention, the column 3 supports the grid lower layer rod 2, and the grid lower layer rod 2 supports the grid upper layer rod 1 by placing the four-corner pyramid web rod 4 to form a double-layer grid structure. In the grid upper layer rod 1, the upper chord rod 11 and the upper chord connecting rod 12 are docked through the upper connecting seat 13, and alternate docking forms a closed structure. In the grid lower layer rod 2, the lower chord rod 21 and the lower chord connecting rod 22 are also docked through the lower connecting seat 23 to form a field-shaped structure. The upper grid rods 1 and the lower grid rods 2 are both in a square grid structure, and are staggered by half a grid, so that the upper connection seat 13 is aligned with the centroid of the corresponding grid in the lower grid rods 2. The upper grid rods 1 and the lower grid rods 2 are connected by a plurality of upright tetrahedral cone web rods 4. Considering the flexibility of aluminum alloy materials, the connection structure of a plurality of upright tetrahedral cone web rods 4 helps to improve the rigidity and stability of the overall structure, so that the double-layer grid structure has high strength and excellent wind and earthquake resistance, and is particularly suitable for large-span building scenes such as temporary exhibition venues, stadiums, and storage facilities.

[0046] In this embodiment, the upper chord rod 11, the lower chord rod 21, the upper chord connecting rod 12, the lower chord connecting rod 22, the upper connecting seat 13, the lower connecting seat 23 and the upright quadrangular pyramid web rod 4 are all prefabricated parts made of aluminum alloy. The aluminum alloy material has the advantages of light weight and corrosion resistance, which can significantly reduce the dead weight of the structure, so that the weight of each component is well controlled, and the foundation and transportation costs are reduced. The upper connecting seat 13 and the lower connecting seat 23 in this embodiment are fixedly connected to each component by bolts or pins, and each connection node can be quickly assembled and disassembled, which is conducive to saving construction time.

[0047] Compared with traditional steel structures, the assembled aluminum alloy double-layer grid structure system of the present invention not only performs well in installation speed, weight control and weather resistance, but also significantly reduces noise and pollution at the construction site, meeting the requirements of modern green buildings. The structural system provided by the present invention can greatly improve the construction efficiency of temporary or semi-permanent buildings, and improve their economy and safety in long-term use. It provides a lightweight, high-strength, quick-install, corrosion-resistant, reusable large-span building solution, which is particularly suitable for semi-permanent or temporary buildings such as exhibition halls, storage facilities, and temporary sports stadiums.

[0048] By adopting the double-layer grid structure of the present invention, multiple double-layer grid structures can be spliced ​​through the upper connecting seat 13, the lower connecting seat 23 and the upright four-corner pyramid web rod 4 to form a large-span tent main structure, and then the tarpaulin is laid on the tent main structure to complete the construction of the temporary tent. The tent built with this structure is suitable for temporary or semi-permanent buildings with a span of 30 meters to 70 meters, such as exhibition halls, warehouses, sports venues, etc.

[0049] Preferably, the upper connecting seat 13 includes an upper node assembly and an upper connecting shaft 131; the upper node assembly includes an upper node body 132, an upper mounting hole 133 is provided on the top of the upper node body 132, a first wing plate 134 and a second wing plate 135 are provided on one side, and a third wing plate 136 and a fourth wing plate are provided on the other side; the first wing plate 134 and the third wing plate 136 are symmetrically arranged, and the second wing plate 135 and the fourth wing plate are symmetrically arranged; the upper node body 132 is provided with a through slot, the connecting shaft passes through the through slot, and a bolt is provided in the upper mounting hole 133 to connect with the upper connecting shaft 131; end connecting holes are provided at both ends of the upper connecting shaft 131. In this embodiment, a first wing plate 134, a second wing plate 135, a third wing plate 136 and a fourth wing plate are provided on both sides of the upper node body 132. The four wing plates can be used to connect components in four directions, such as the upper chord connecting rod 12 and the upright four-cornered pyramid web rod 4, so as to achieve rapid fixation in multiple directions. The upper connecting seat 13 adopts a structural design of a combination of an upper node assembly and an upper connecting shaft 131, and the two can be locked and fixed by bolts. End connection holes are respectively provided at both ends of the upper connecting shaft 131 for reinforcement after docking. When the upper chord rod 11 is docked with the upper connecting shaft 131, the upper chord rod 11 is inserted into one end of the upper connecting shaft 131, and then locked and fixed by bolts and the end connection holes.

[0050] Preferably, the surface of the upper connecting shaft 131 is provided with a plurality of outer limiting grooves, and the upper node body 132 is provided with inner limiting grooves matched with the outer limiting grooves; the second wing plate 135 and the fourth wing plate are arranged horizontally, and the first wing plate 134 and the second wing plate 135 are arranged at an angle. Through the above-mentioned structural design of the inner and outer grooves being matched and snapped together, the upper node body 132 and the upper connecting seat 13 are snapped together through the outer limiting grooves and the inner limiting grooves, which not only improves the structural strength of the two, but also keeps the upper connecting shaft 131 and the upper node body 132 fixed in relative position, thereby improving the stability of the grid structure.

[0051] Preferably, the lower connecting seat 23 includes a lower node assembly and a lower connecting shaft 231, and a detachable side support 232 is provided at the bottom of the lower node assembly as needed; the lower node assembly includes a lower node body 233, and the lower connecting shaft 231 is nested in the lower node body 233; snap-in grooves are provided on both sides of the lower node body 233, and a snap-in strip matched with the snap-in groove is provided on the side support 232, and the side support 232 is snap-connected with the lower node body 233 through the snap-in groove and the snap-in strip; the side support 232 is connected to the top of the column 3.

[0052] In this embodiment, the lower connecting seat 23 includes a lower node assembly and a lower connecting shaft 231, wherein the lower node assembly is used to connect the lower chord connecting rod and the upright tetrahedral cone web rod 4, and the lower connecting shaft 231 is used to connect the lower chord rod 21. A detachable side support 232 is provided at the bottom of the lower node assembly as required. When the entire lower connecting seat 23 is used at the position of the column 3, the lower node assembly includes the side support 232, and the side support 232 is used to connect the column 3, forming a node that can connect the lower chord rod 21, the lower chord connecting rod, the upright tetrahedral cone web rod 4 and the column 3.

[0053] In order to achieve quick disassembly and assembly, the present embodiment is provided with snap-in grooves on both sides of the lower node body 233, and corresponding snap-in strips are provided on the side support 232. When installing, the side support 232 slides in from one side along the length direction of the snap-in groove, and the snap-in strip is connected with the snap-in groove, so that the side support 232 and the lower node body 233 can be stably snap-in. Next, the lower chord 21 is inserted into the lower connecting shaft 231 and is locked by bolts. At this time, the side support 232 abuts against the lower chord 21 and can be blocked by the lower chord 21, so that the position of the side support 232 is fixed on the lower connecting shaft 231. When the lower connecting seat 23 of the present embodiment is installed at the corner of the tent, one end of the lower connecting shaft 231 is connected to the lower chord 21, and a blocking cover can be provided at the other end, so that the side support 232 can be fixed on the lower connecting shaft 231.

[0054] Preferably, the structure of the upper node assembly is the same as that of the lower node assembly, and the structure of the upper connecting shaft 131 is the same as that of the lower connecting shaft 231. In this embodiment, in order to realize a modular assembly structure, the upper node assembly and the lower node assembly, the upper connecting shaft 131 and the lower connecting shaft 231 all use components with the same structure, and during installation, the upper node assembly and the lower node assembly are reversed with each other, and the upper connecting shaft 131 and the lower connecting shaft 231 are also reversed with each other.

[0055] Preferably, an articulated mechanism is provided between the side support 232 and the column 3; the articulated mechanism includes an upper articulated seat and a lower articulated seat, the upper articulated seat is connected to the bottom of the side support 232, and the lower articulated seat is connected to the top of the column 3; the upper articulated seat and the lower articulated seat are rotatably connected via a latch. In this embodiment, an articulated structural design is adopted between the side support 232 and the column 3, allowing rotation or displacement within a certain range to adapt to foundation settlement or wind load conditions.

[0056] Preferably, the end of the upper chord 11 is matched with the upper connecting shaft 131; during installation, the upper connecting shaft 131 is inserted into the end of the upper chord 11 and fixedly connected by bolts or pins; the end of the lower chord 21 is matched with the lower connecting shaft 231; during installation, the lower connecting shaft 231 is inserted into the end of the lower chord 21, and the connection is fixedly connected by bolts or pins.

[0057] Preferably, the base 5 includes a column foot connector and a ground connector, the column foot connector includes a plug-in portion, a cover plate 51 and a semi-rigid connection seat 52, the plug-in portion is inserted into the bottom of the column 3 and fixedly connected by bolts; the cover plate 51 is used to block the bottom of the column 3, and the semi-rigid connection seat 52 is arranged at the bottom of the cover plate 51; the ground connector includes a bottom plate 53 and a plug-in base 54, the bottom plate 53 is used to connect the bottom surface, and the hinged base 54 is provided with a plurality of plug-in holes, and the plug-in holes are connected to the semi-rigid connection seat through a pin shaft. In this embodiment, a plurality of spaced plug-in holes are provided on the plug-in base 54, and two groups of plug-in holes at different heights can be selected for installation and connection according to actual needs. The plug-in holes are connected to the semi-rigid connection seat through a pin shaft to form a stable fixed structure. Based on the adjustable structural design, the grid structure can adapt to different foundation conditions and ensure structural stability.

[0058] Preferably, the lower chord rod is a multi-segment line of m equal parts of the lower chord arc line, the chord length of the lower chord arc is md, and the radius of the lower chord arc line is R 1 The following conditions are met:

[0059] The angle of the lower chord arc θ 1 The following conditions are met: -α≤θ 1 ≤α,

[0060] Standard length of lower chord d 1 The following conditions are met:

[0061] The upper chord rod is the straight-line distance between the two end points of the upper chord arc line, and the radius R of the upper chord arc line 2 The following conditions are met: 2 =R 1 +h;

[0062] The number of cells of the upper chord is m-1, and the angle of the upper chord arc is θ 2 The following conditions are met: -β≤θ 2 ≤β,

[0063] The sagitta of the upper chord arc f 2 The following conditions are met:2 =R 2 (1-cosβ);

[0064] Quasi length of upper chord d 2 The following conditions are met:

[0065] Standard member length d of upright tetrahedral pyramid web member 3 The following conditions are met:

[0066] Among them, d is the standard size of the building column grid;

[0067] d 1 It is the standard length of the lower chord;

[0068] d 2 is the quasi-length of the upper chord;

[0069] d 3 It is the standard member length of the upright tetrahedral cone web member;

[0070] m is the number of units in the span direction of the grid;

[0071] n is the number of units in the length direction of the grid;

[0072] H is the height of the top of the lower chord column of the grid;

[0073] f 1 Arch height of lower chord of grid frame;

[0074] h Grid height.

[0075] The same type of rods, node components, and connection seats of the large-span assembled aluminum alloy double-layer grid have the same specifications, which has the advantages of fast response production and processing, construction and installation, and flexible disassembly. In order to achieve the same specifications of the same type of rods, node components, and connection seats, in the structure of this embodiment, the spatial relationship of the grid can be analyzed by mathematical expressions, which are explained in conjunction with the embodiments below:

[0076] Taking the aluminum alloy grid with a span of 60m, a length of 100m, and a height of 8m as an example, the standard size of the column grid is d = 5m, the number of cells in the span direction is m = 12, the number of cells in the length direction is n = 20, and the arch height of the lower chord is f 1 =1.0mm, grid height h=2m, calculated according to this technical standard and standard unit cell length of grid rods:

[0077] The standard length d of the upper and lower chord connecting rod unit cell is: d = 5m;

[0078] The radius of the lower chord arc is R 1 for:

[0079] The angle of the lower chord arc θ 1 The range is: -α≤θ 1 ≤α,

[0080] Standard length of lower chord unit cell d 1 for:

[0081] The radius R of the arc line of the upper chord of the grid 2 For: R 2 =R 1 +h = 452.5m;

[0082] The angle of the upper chord arc θ 2 The range is: -β≤θ 2 ≤β,

[0083] The sagitta of the arc of the upper chord 2 is: f 2 =R 2 (1-cosβ)=0.8841m;

[0084] Standard length of upper chord unit cell d 2 for:

[0085] Standard member length d of upright tetrahedral pyramid web member 3 for:

[0086] Based on the standard lengths d, d of each bar unit cell mentioned above 1 ,d 2 ,d 3 In-depth design of components and connectors can realize the rapid construction of the grid structure, which not only improves the design efficiency of the double-layer grid, but also ensures tight docking between nodes, high connection accuracy, efficient construction and installation, and flexible disassembly.

[0087] Preferably, the upper layer rods 1 of the truss are a truss of rectangular structure, including two upper chord rods 11, two upper chord connecting rods 12 and four upper connecting seats 13; the upper chord rods 11 and the upper chord connecting rods 12 are alternately arranged and connected through the upper connecting seats 13; the lower layer rods 2 of the truss are a truss of field-shaped structure, and the field-shaped structure includes three longitudinal ribs and three transverse ribs; the longitudinal ribs are composed of two lower chord rods 21 and the lower connecting seats 23, and the transverse ribs are composed of two lower chord connecting rods 22 and the lower connecting seats 23; the number of the upright quadrilateral pyramidal web rods 4 is sixteen, and each of the upper connecting seats 13 is respectively connected to four upright quadrilateral pyramidal web rods 4, and the other ends of the four upright quadrilateral pyramidal web rods 4 are respectively fixedly connected to the four closest lower connecting seats 23.

[0088] In this embodiment, the upper layer rod 1 of the grid frame adopts a connection method of two upper chord rods 11 and two upper chord connecting rods 12 alternately in sequence, enclosing a rectangular structure, and the four corners of the rectangular structure are upper connecting seats 13. The lower layer rod 2 of the grid frame adopts a field-shaped structure, and the four grids of the field shape are respectively composed of lower chord rods 21 and lower chord connecting rods 22 alternately connected, and the four corners are respectively lower connecting seats 23. The upper layer rod 1 of the grid frame and the lower layer rod 2 of the grid frame are connected by sixteen upright four-corner pyramidal web rods 4, and the bottom end of each upright four-corner pyramidal web rod 4 is connected to the lower connecting seat 23 in the grid lower layer rod 2, and the top end is connected to the upper connecting seat 13 of the upper layer rod 1 of the grid frame. Specifically, taking one of the grids of the field-shaped structure as an example, the lower connecting seats 23 at the four corners of the grid are respectively connected to a square pyramid web rod 4, and the tops of the four square pyramid web rods 4 meet at the same upper connecting seat 13, and this upper connecting seat 13 is located at the center above the grid. Then, all the upper connecting seats 13 are connected to form a stable upper and lower layer connection structure. Through the inclined installation method, when the upper layer rod 1 of the grid is subjected to force, the pressure can be evenly distributed to each lower connecting seat 23 below, effectively improving the rigidity and stability of the overall structure. Through the above-mentioned structural design, the upper layer rod 1 of the grid and the lower layer rod 2 of the grid are both rectangular or quasi-rectangular structures, with strong stability, and can be easily docked with the double-layer grid structure next to it to quickly expand the area of ​​the tent, with the advantages of convenient installation and strong expansibility.

[0089] The assembled aluminum alloy double-layer grid structure provided by the present invention realizes rapid on-site assembly by prefabricating standardized grid upper rods and grid lower rods, as well as efficient upper connecting seats and lower connecting seats connecting nodes. The grid upper rods are composed of upper chord rods, upper chord connecting rods and upper connecting seats, and the grid lower rods are composed of lower chord rods, lower chord connecting rods and lower connecting seats. The upper connecting seat and the lower connecting seat are docked by placing the four-cornered pyramid web rods upright to achieve the docking of the upper and lower rods of the grid and form a stable spatial structure system. The double-layer grid structure of the present invention adopts a modular design, and the aluminum alloy material has the advantages of lightweight and corrosion resistance, which can significantly reduce the dead weight of the structure and reduce the foundation and transportation costs; each connection node can be quickly assembled and disassembled, saving construction time. In addition, each component can be reused, which is convenient for recycling and reuse, and can be adjusted according to different terrains and environmental conditions, and has strong adaptability. The present invention has high strength and excellent wind and earthquake resistance, and is particularly suitable for large-span building scenes such as temporary exhibition venues, stadiums, and storage facilities.

[0090] The above is a detailed introduction to the assembled aluminum alloy double-layer grid structure provided by the present invention. For those skilled in the art, according to the ideas of the embodiments of the present invention, there may be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. An assembled aluminum alloy double-layer grid structure, characterized in that: The invention comprises an upper layer of grid rods (1), a lower layer of grid rods (2) and a plurality of columns (3); a plurality of upright tetrahedral pyramidal web rods (4) are arranged between the upper layer of grid rods and the lower layer of grid rods; the upper layer of grid rods comprises a plurality of upper chord rods (11), a plurality of upper chord connecting rods (12) and a plurality of upper connecting seats (13), and the upper chord rods and the upper chord connecting rods are connected via the upper connecting seats; the lower layer of grid rods comprises a plurality of lower chord rods (21), a plurality of lower chord connecting rods (22) and a plurality of lower connecting seats (23), and the lower chord rods and the lower chord connecting rods are connected via the lower connecting seats; one end of the upright tetrahedral pyramidal web rod is connected to the upper connecting seat, and the other end is connected to the lower connecting seat; the lower connecting seat is connected to the top of the column, and a base (5) is arranged at the bottom of the column.

2. The assembled aluminum alloy double-layer grid structure according to claim 1 is characterized in that: The upper connecting seat comprises an upper node assembly and an upper connecting shaft (131); the upper node assembly comprises an upper node body (132); an upper mounting hole (133) is provided on the top of the upper node body; a first wing plate (134) and a second wing plate (135) are provided on one side; a third wing plate (136) and a fourth wing plate are provided on the other side; the first wing plate and the third wing plate are symmetrically arranged, and the second wing plate and the fourth wing plate are symmetrically arranged; the upper node body is provided with a through slot, the connecting shaft passes through the through slot, a bolt is provided in the upper mounting hole to connect with the upper connecting shaft; end connecting holes are provided at both ends of the upper connecting shaft.

3. The assembled aluminum alloy double-layer grid structure according to claim 2 is characterized in that: The surface of the upper connecting shaft is provided with a plurality of outer limiting grooves, and the upper node body is provided with inner limiting grooves matching with the outer limiting grooves; the second wing plate and the fourth wing plate are arranged horizontally, and the first wing plate and the second wing plate are arranged at an angle.

4. The assembled aluminum alloy double-layer grid structure according to claim 3 is characterized in that: The lower connecting seat comprises a lower node assembly and a lower connecting shaft (231); a detachable side support (232) is provided at the bottom of the lower node assembly as required; the lower node assembly comprises a lower node body (233), and the lower connecting shaft is nested in the lower node body; snap-fitting grooves are provided on both sides of the lower node body, and a snap-fitting strip matched with the snap-fitting groove is provided on the side support, and the side support is snap-fitted to the lower node body via the snap-fitting groove and the snap-fitting strip; the side support is connected to the top of the column.

5. The assembled aluminum alloy double-layer grid structure according to claim 4 is characterized in that: The structure of the upper node assembly is the same as that of the lower node assembly, and the structure of the upper connecting shaft is the same as that of the lower connecting shaft.

6. The assembled aluminum alloy double-layer grid structure according to claim 4 is characterized in that: An articulated mechanism is provided between the side support and the column; the articulated mechanism comprises an upper articulated seat and a lower articulated seat, the upper articulated seat is connected to the bottom of the side support, and the lower articulated seat is connected to the top of the column; the upper articulated seat and the lower articulated seat are rotatably connected via a latch.

7. The assembled aluminum alloy double-layer grid structure according to claim 3 is characterized in that: The end of the upper chord is matched with the upper connecting shaft; during installation, the upper connecting shaft is inserted into the end of the upper chord and fixedly connected by bolts or pins; the end of the lower chord is matched with the lower connecting shaft; during installation, the lower connecting shaft is inserted into the end of the lower chord and fixedly connected by bolts or pins.

8. The assembled aluminum alloy double-layer grid structure according to claim 4 is characterized in that: The base comprises a column foot connector and a ground connector, the column foot connector comprises a plug-in portion, a cover plate (51) and a semi-rigid connection seat (52), the plug-in portion is inserted into the bottom of the column and fixedly connected via bolts; the cover plate is used to seal the bottom of the column, and the semi-rigid connection seat is arranged at the bottom of the cover plate; the ground connector comprises a bottom plate (53) and a plug-in base (54), the bottom plate is used to connect the bottom surface, and the plug-in base is provided with a plurality of pin holes, and the pin holes are connected to the semi-rigid connection seat via pin shafts.

9. The assembled aluminum alloy double-layer grid structure according to any one of claims 1 to 8, The angle θ1 of the lower chord arc satisfies the following conditions: -α≤θ1≤α, The standard length d1 of the lower chord satisfies the following conditions: The upper chord rod is the straight-line distance between the two end points of the upper chord arc line, and the radius R2 of the upper chord arc line satisfies the following condition: R2=R1+h; The number of cells of the upper chord rod is m-1, and the angle θ2 of the upper chord arc satisfies the following conditions: The sagitta f2 of the upper chord arc satisfies the following condition: f2 = R2 (1-cosβ); The quasi-length d2 of the upper chord satisfies the following conditions: The standard member length d3 of the upright tetrahedral pyramid web member meets the following conditions: in, d is the standard size of the building column grid; d1 is the standard length of the lower chord; d2 is the quasi-length of the upper chord; d3 is the standard member length of the upright tetrahedral cone web member; m is the number of units in the span direction of the grid; n is the number of units in the length direction of the grid; H is the height of the top of the lower chord column of the grid; f1 The arch height of the lower chord of the grid; h Grid height.

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